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Hello FreeSurfer Experts,

I am using mri_vol2surf to map a volume onto a surface, with the registration .dat file generated via bbregister. I would like to understand how the input volume is being sampled to generate the surface and how to visualize the sampled points.

mri_vol2surf --src "$input_volume" --out "$output_surface" --srcreg "$output_reg_file" --hemi lh --projfrac 0.2

Specifically, how can I display the input_volume along with the sampled points at a projfrac of 0.2 on Freeview?

Thank you in advance for your help!

Shraddha